How does homesickness express the author's thoughts and feelings?

Homesickness is a modern poem written by Yu Guangzhong, a poet, after he returned from a foreign land. Poetry expresses a kind of nostalgia for hometown and motherland. This poem also embodies the poet Yu Guangzhong's good wish for the early reunification of the Chinese nation.

Yu Guangzhong's Homesickness

When I was a child, homesickness was a small stamp.

I'm here and my mother is there.

When I grow up, homesickness is a narrow ticket.

I'm here and the bride is there.

Later, homesickness became a temporary grave.

I'm outside and my mother is inside.

Now, homesickness is a shallow strait.

I am here and the mainland is there.

Just like the poem "Homesickness", it contains feelings.

Stamp is an image, and the boat tickets, stamps, graves and so on in the poem are all images, all of which are entrusted with homesickness.

A stamp in that youth, a boat ticket in that youth, and even the future grave all contain the poet's homesickness for Qian Qian's thousands of overseas wanderers.